Supply-pipe connection for oil burners



R; HOFFMAN SUPPLY PIPE CONNECTION FOR OIL BURNERS July 14, 1925.

Filed March 1923 EEEEvZ i ll Patented July 14, 1925.

SIIT RUDOLPH :IIOFFMAN; 0F KANKiAjKjEZfiILItINDIS; ASSIGNOR SEARS 00,01?GHlC'AGO, ILLINOISQA CORPORATIONOF*NEW YORK.

1,545,492 PAIIZEJNJEQEETQEL ROEBUCK AND suPnLY rmn GONNEGTIO'NJ non: omBURNER-S;

Arn pa-med-iM- ia 22. as. se ina ans,

To all whom, it may concern:

Be' it: known, that: I, RUDOLPH HOFFMAN, a citizen of the United States,residing at Kankakce, in the county of Kankakee and State of Illinois,have invented a certain new and useful Supply-Pipe Connection for.

Oil Burners, of which the following is a specification. The inventionpertains in general to oil stoves, and has particular reference to aconnection between the oil supply pipe and the burner or burners.

The object of the invention is to produce a means of simplifiedconstruction providing an effectual connection between an oil supplypipe and the fitting which communicates with the burner.

In the accompanying drawings wherein I have illustrated a preferredembodiment of my invention, Figure 1 is a fragmentary side elevationalview of a burner in the posi tion which it occupies in the stove. Fig. 2a vertical sectional View illustrating the connection between the burnerand the oil supply pipe. Fig. 3 is a longitudinal sectional View throughthe connection and a portion of the supply pipe.

A burner 7, of usual orpreferred con-- struction, is herein shown asmounted directly upon an oil supply pipe 8 and a parallel supporting bar9 beneath the grid 10 of the stove. For engagement with the bar 9, thelower portion of the burner carries a bracket 11 adapted to interengagewith the bar in such a manner as to prevent the burner from being movedupwardly when the burner is connected to the supply pipe. The connectionbetween the burner and the supply pipe comprises a fitting 12 which inthe present instance is rigidly secured directly to the lower portion ofthe burner '7 atone sidethereof so as to be in communication with theannular wick chamber of the burner. Preferably the fitting is brazed tothe burner so as to form an oil-tight joint.

The fitting 12 has a passageway 13 therethrough for the oil, and theouter or free end of the fittinghas a depending tubular portion latwhich is adapted to seat upon a washer 15 of relatively soft metal,such. as lead, within a cup member 16 seated upon the supply pipe 8.This cup member is apertured centrally thereof to receive a nipple 17screwthreaded into the pipe 8. Preferably the lower end of the nipple istapered .0 that. when. screwedjdown tightly into the screw-threadedaperture prQvidedZ therefor in the pipe, a tight joint will be secured.As shown clearly in Figs. 2 and 3, the upper surface of the pipesurrounding the nipple 17 is flattened, and this for a twofold reason.Thus, the flattened surface provides a broad and fiat seat for the cupmember 16; and more important, the entire thickness of the metal of thepipe is utilized for purposes ofthreading the nipple into the pipe. Torender the pipe non-corrosive it is dipped in a molten bath of tin orother suitable metal. This tinning of the pipe serves incidentally toseal the joint between it and the nipple around the threads, thusrendering the joint absolutely oil'tight.

The washer 15 encircles the nipple 17 with a snug fit, and the aperturein the bottom of the cup member for recei'ving the nipple is made ofthesame diameter as the external diameter of the nipple. tubular portion 14of the fitting may bemade slightly larger in diameter than the externaldiameter of the nipple, and this fitting is clamped downwardly upon thewasher 15 by suitable means, suchas a yoke 18 having depending aperturedportions 19 encircling the pipe on opposite sides of the litting. A nut20 engages in the bottom of the yoke, and this nut receives a clampingscrew 21 the lower end of which bears in a socket 22 formed in the upperside of the fitting 12.

It will be apparent that upon tightening the screw 21, the lowerdepending portion 14-. of the fitting becomes embedded in the soft metalof the washer 15 and thus prevents the passage of the oil between thelower end of the fitting and the upper surface of the washer. At thesame time the metal of the washer becomes compressed and, expandinglaterally, is forced against the outer periphery of the nipple thusforming an oil-tight joint between the washer and the nipple also.

7 In the manufacture of the supply pipe and burner connection hereinillustrated and described, the pipe may be punched andfiattened in asingle operation to form the seat for the cup member and to form theaperture to receive the nipple. The aperture is then tapped and thenipple screwed into position whereupon the pipe is dipped for tinningasabove set forth.

The depending I I claim as my invention:

In an'oil stove, the combination with a burner and an oil supply pipe,of a con nection between the burner and thesupply pipe including atubular member connected with the burner, a nipple screw-threaded intothe pipe, said pipe'together with the nipple mounted therein having acoating of tin or the like serving to seal the joint between the nippleand the pipe, and means for providing an oil-tight'joint between thenipple and said tubular member including a soft metal washer, and a cupmember in which said Washer is seated and having an aperture in itsbottom closely encircling said nipple, said pipe being flattened to forma flat seat for the cup-like member and to utilize the entire thicknessof the metal 01" the pipe at the joint between it and the nipple.

In testimony whereof, I have hereunto affixed'my signature.

RUDOLPH HOFFMAN.

